DOC: Fixes for 18 broken links (#16472)

* DOC: Fixes for 18 broken links

This, with PR #16465, should fix nearly all the remaining broken links
on the site. 4 or 5 others should be easy to fix and just
need attention from someone more knowledgeable -- will
open an issue. For release notes with dead links,
I could usually find links on archive.org for roughly contemporary
versions.

* DOC: Update to "Fixes for 18 broken links #16472"

* Obsolete links, previously commented out, now deleted:
https://github.com/numpy/numpy/pull/16472#discussion_r433928958

* Semantic markup for reference to Python class:
https://github.com/numpy/numpy/pull/16472#discussion_r433553928

* Missing :ref: in internal link:
https://github.com/numpy/numpy/pull/16472#discussion_r433554484

Not included: Resolution on using external/internal doc link in .py:
https://github.com/numpy/numpy/pull/16472#discussion_r433554824

* DOC: Add internal link for 'Fixes for 18 broken links' PR #16472

Making reference [1] an internal link in function_base.py => numpy.vectorize.html

* DOC: Redirect 2 link fixes in PR #16472

* governance.rst link reverted
* ununcs.rst `overridden` link goes where it was meant to


per https://github.com/numpy/numpy/pull/16472#pullrequestreview-424666070

4 files changed, 5 insertions, 6 deletions

diff --git a/numpy/lib/function_base.py b/numpy/lib/function_base.py
index 4ebca6360..cf6f4891c 100644
--- a/numpy/lib/function_base.py
+++ b/numpy/lib/function_base.py
@@ -1971,8 +1971,7 @@ class vectorize:
 
     References
     ----------
-    .. [1] NumPy Reference, section `Generalized Universal Function API
-           <https://docs.scipy.org/doc/numpy/reference/c-api.generalized-ufuncs.html>`_.
+    .. [1] :doc:`/reference/c-api/generalized-ufuncs`
 
     Examples
     --------
@@ -3120,7 +3119,7 @@ def i0(x):
     .. [2] M. Abramowitz and I. A. Stegun, *Handbook of Mathematical
            Functions*, 10th printing, New York: Dover, 1964, pp. 379.
            http://www.math.sfu.ca/~cbm/aands/page_379.htm
-    .. [3] http://kobesearch.cpan.org/htdocs/Math-Cephes/Math/Cephes.html
+    .. [3] https://metacpan.org/pod/distribution/Math-Cephes/lib/Math/Cephes.pod#i0:-Modified-Bessel-function-of-order-zero
 
     Examples
     --------
diff --git a/numpy/lib/mixins.py b/numpy/lib/mixins.py
index 50157069c..c81239f6b 100644
--- a/numpy/lib/mixins.py
+++ b/numpy/lib/mixins.py
@@ -68,7 +68,7 @@ class NDArrayOperatorsMixin:
     It is useful for writing classes that do not inherit from `numpy.ndarray`,
     but that should support arithmetic and numpy universal functions like
     arrays as described in `A Mechanism for Overriding Ufuncs
-    <../../neps/nep-0013-ufunc-overrides.html>`_.
+    <https://numpy.org/neps/nep-0013-ufunc-overrides.html>`_.
 
     As an trivial example, consider this implementation of an ``ArrayLike``
     class that simply wraps a NumPy array and ensures that the result of any
diff --git a/numpy/polynomial/chebyshev.py b/numpy/polynomial/chebyshev.py
index 4ddb0c688..431617414 100644
--- a/numpy/polynomial/chebyshev.py
+++ b/numpy/polynomial/chebyshev.py
@@ -104,7 +104,7 @@ References
 ----------
 .. [1] A. T. Benjamin, et al., "Combinatorial Trigonometry with Chebyshev
   Polynomials," *Journal of Statistical Planning and Inference 14*, 2008
-  (preprint: https://www.math.hmc.edu/~benjamin/papers/CombTrig.pdf, pg. 4)
+  (https://web.archive.org/web/20080221202153/https://www.math.hmc.edu/~benjamin/papers/CombTrig.pdf, pg. 4)
 
 """
 import numpy as np
diff --git a/numpy/testing/_private/nosetester.py b/numpy/testing/_private/nosetester.py
index bd6d002aa..57691a448 100644
--- a/numpy/testing/_private/nosetester.py
+++ b/numpy/testing/_private/nosetester.py
@@ -352,7 +352,7 @@ class NoseTester:
         coverage : bool, optional
             If True, report coverage of NumPy code. Default is False.
             (This requires the
-            `coverage module <https://nedbatchelder.com/code/modules/coveragehtml>`_).
+            `coverage module <https://pypi.org/project/coverage/>`_).
         raise_warnings : None, str or sequence of warnings, optional
             This specifies which warnings to configure as 'raise' instead
             of being shown once during the test execution. Valid strings are: